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Table 2 Current progress in genetic discoveries for some of the modifiable environmental risk factors

From: Modifiable environmental exposure and risk of rheumatoid arthritis—current evidence from genetic studies

Traits

Author

Measures

Ancestry

Year

# Individuals

# IVs

Variance explained by genome-wide SNPs

Smoking

Liu et al.

Smoking initiation (ever vs. never smoking)

European

2019

1,232,091

378

8.0%

Smoking

Liu et al.

Cigarette per day

European

2019

337,334

55

7.8%

Smoking

Liu et al.

Smoking cessation

European

2019

547,219

24

4.6%

Alcohol consumption

Liu et al.

Drinks per week

European

2019

941,280

99

4.2%

Physical activity

Doherty et al.

Accelerometer-measured overall physical activity

European

2018

91,105

14

15%

Physical activity

Klimentidis et al.

Self-reported habitual physical activity

European

2018

337,234

8

5%

Body mass index

Pulit et al.

Body mass index

European

2018

694,649

941

22.4%

Vitamin D

Revez et al.

Circulating vitamin D levels

European

2019

417,580

143

13%

Vitamin D

Manousaki et al.

Circulating vitamin D levels

European

2020

401,460

138

4.9%

Educational attainment

Lee et al.

Number of years of schooling

European

2018

1,131,881

1271

12.2%

Depression

Howard et al.

Major depression disorder

European

2019

807,553

102

8.9%

Mood change

Ward et al.

Mood instability

European

2019

363,705

46

9.0%